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  • SPACE SCIENCES  (187)
  • SPACE VEHICLES  (41)
  • ENERGY PRODUCTION AND CONVERSION
  • 1975-1979
  • 1970-1974  (242)
  • 1974  (242)
Collection
Keywords
Years
  • 1975-1979
  • 1970-1974  (242)
Year
  • 1
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    Venus - Mass, gravity field, atmosphere, and ionosphere as measured by the Mariner 10 dual-frequency radio system (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The unique properties of the Mariner 10 radio system, and the preliminary scientific results obtained from the analysis of the radio signals are described. In the normal two-way communication mode, a command- and range-modulated 2115-MHz signal is transmitted to the spacecraft for reception on its omnidirectional antenna. As implemented for Mariner 10, the dual-frequency system has proven fully capable of performing interplanetary columnar electron content measurements while achieving the prime goals of the celestial mechanics and radio science team. The determination of the mass and gravitational potential of Venus is one of the major objectives of the radio science experiments. Information on Venus's atmosphere was deduced from analysis of the radio signals during occultation. Open-loop receiver differential Doppler data were used to measure the nightside and dayside ionospheres of Venus.
    Keywords: SPACE SCIENCES
    Type: Science; 183; Mar. 29
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A users manual for a computer program which calculates time optical geocentric transfers using solar or nuclear electric and high thrust propulsion (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This manual is a guide for using a computer program which calculates time optimal trajectories for high-and low-thrust geocentric transfers. Either SEP or NEP may be assumed and a one or two impulse, fixed total delta V, initial high thrust phase may be included. Also a single impulse of specified delta V may be included after the low thrust state. The low thrust phase utilizes equinoctial orbital elements to avoid the classical singularities and Kryloff-Boguliuboff averaging to help insure more rapid computation time. The program is written in FORTRAN 4 in double precision for use on an IBM 360 computer. The manual includes a description of the problem treated, input/output information, examples of runs, and source code listings.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-139038 , R-827
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Geological mapping of the moon (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Compilation and labelling of geological and morphological charts on a scale of 1:1,000,000 are discussed with emphasis on the regions of Maria Tranquilitatis, Crisium, Fecunditatis, Humorum and Nukium as well as certain prominent craters.
    Keywords: SPACE SCIENCES
    Type: Current Concepts Regarding the Moon (NASA-TT-F-766); p 97-138
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Possible H2/+/ ultraviolet spectrum of Jupiter (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: An ultraviolet spectral probe for a hydrogen-rich planetary atmosphere, such as that of Jupiter, is suggested, utilizing discrete lines in the H2(+) 2p pi u - /s sigma g electronic transition. For the Jovian atmosphere, the dominant mechanism for exciting H2(+) to its 2p pi u state appears to be photoexcitation, principally through absorption of the solar Lyman-alpha line. The critical role of corrections to the Born-Oppenheimer approximation in the use of an H2(+) probe is discussed.
    Keywords: SPACE SCIENCES
    Type: Icarus; 22; June 197
    Format: text
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  • 5
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    Jupiter's clouds - Equatorial plumes and other cloud forms in the Pioneer 10 images (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The imaging photopolarimeter experiment aboard the Pioneer 10 spacecraft produced two-dimensional maps of intensity and polarization in red and blue light at high resolution during flyby of Jupiter in December 1973. The present article describes cloud forms seen in the equatorial zone and compares them with rotational periods as a function of latitude derived from earth-based observations of features on Jupiter. A striking new feature consists of a bright, well-defined nucleus in the equatorial zone, with a plume apparently drawn out from the core of the nucleus.
    Keywords: SPACE SCIENCES
    Type: Science; 184; June 21
    Format: text
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  • 6
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    Modified Brans-Dicke gravitational theory with nonzero divergence of the energy-momentum tensor (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The Brans-Dicke theory of gravitation is modified by assuming that the divergence of the energy-momentum tensor is proportional to the covariant derivative of the scalar curvature. No ad hoc additions to the usual Brans-Dicke field equations are required as in Rastall's modification of the Einstein theory or as in the steady-state theories, of which this is a natural possibility. Three parameters emerge from the theory - namely, the unnormalized gravitational constant, the usual Brans-Dicke parameter, and the proportionality constant. In the post-Newtonian approximation, these parameters can be fixed by experiment. However, there exists a certain choice of the parameters for which the theory reduces to an Einstein theory with constant scalar curvature.
    Keywords: SPACE SCIENCES
    Type: Physical Review D - Particles and Fields; vol. 9
    Format: text
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  • 7
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    Are BL Lac-type objects nearby black holes (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: It is pointed out that isolated black holes accreting interstellar gas can account for the characteristic properties of the Lacertids. Emission spectra for various interstellar gas densities and black hole masses are compared with the data plotted by Strittmatter et al. (1972) for the BL Lac-type objects. Rough estimates indicate that there may indeed be a finite number of stellar-mass black holes close to the earth as required by the theory. If it is determined that the BL Lac-type objects lie outside of the galactic disk a black hole accretion model may still apply if certain conditions are satisfied.
    Keywords: SPACE SCIENCES
    Type: Nature; 250; July 12
    Format: text
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  • 8
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    Zodiacal light and the asteroid belt - The view from Pioneer 10 (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Brightnesses measured by the Pioneer 10 imaging photopolarimeter in two regions of sky were compared on sky maps at sun-spacecraft distances from 2.4 to 4.8 AU to determine the spatial extent of the zodiacal light. Data in the ecliptic at elongations greater than 90 deg show negligible contribution to the zodiacal light beyond 3.3 AU, the 2:1 Jupiter resonance. The zodiacal light brightness at 2.4 AU is less than 10% of that observed at 1 AU.
    Keywords: SPACE SCIENCES
    Type: Journal of Geophysical Research; 79; Sept. 1
    Format: text
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  • 9
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    Evolution of the Moon's orbit and the origin of life (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Indications about the past history of the lunar orbit that are yielded by palaeontological data derived from periodicities in fossil corals are shown to suggest that the moon approached the earth 2,850 plus or minus 250 Myr BP. Convergent evidence in the geological record indicates that a pulse of high temperature volcanism occurred about 2800 Myr BP. The implied catastrophe roughly coincides with the first records of life. It seems within the realm of possibility that a global thermal event might have been involved in the origin of life.
    Keywords: SPACE SCIENCES
    Type: Nature; 251; Sept. 13
    Format: text
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  • 10
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    Data catalog of satellite experiments: Ionospheric physics, meteorology, and planetary atmospheres, supplement 2a to NSSDC-71-20 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The purposes of the data catalog are to announce the availability of experimental space science data, to describe these data, and to inform potential users of the policies and procedures associated with data dissemination services.
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-72531 , NSSDC-74-15A
    Format: application/pdf
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